package design.patterns.observer.advanceobserver.exercise;

/**
 * desc :
 * time : 2020-07-21 18:54
 *
 * @author wwchen
 */
public class MainTest {
    public static void main(String[] args) {
        ConcretSubject subject = new ConcretSubject();
        ConcretObserver observer = new ConcretObserver();
        subject.addObserver(observer);
        subject.change();
    }
}
